电流对电渣重熔过程多场耦合行为和凝固参数影响的数值模拟

利用了FLUENT软件建立了电渣重熔(ESR)过程二维轴对称瞬态模型.使用有限体积法求解耦合的电磁场、动量和能量守恒方程,铸锭的凝固过程由焓-多孔介质模型处理,系统地研究了电流对电渣重熔GH984G凝固过程多场耦合行为和凝固参数的影响规律.模拟结果表明:电流由2.3kA增大为2.5kA,体系中电流密度、磁感应强度、洛伦...

Numerical simulation of effects of currents on multi field coupling behavior and solidification parameters during electroslag remelting process

A two dimensional transient mathematical model of electroslag remelting(ESR) process was established by using FLUENT software. The finite volume method was used to solve the coupled equations of electromagnetic field, momentum and energy conservation. The solidification process of ingot was treated by the enthalpy porous medium model. The multi field coupling behavior and solidification parameters of GH984G superalloy during ESR process were systematically studied. The results show that the current density, magnetic induction, Lorentz force and Joule heat increase with the current increases from 2.3kA to 2.5kA. And then, the slag flow velocity increases, the temperature of slag bath and metal pool increases, and the metal pool deepens. As a result, the primary and secondary dendrite arm spacing and the relative Rayleigh number of ingot increase correspondingly, and the tendency of freckles formation also increases. The calculated values are in good agreement with the measured values.